tepphar 881w

I bought tepphar 881w in size 32/32 and it fits and looks alite butt I can also go with 30/32 and 31/32. I am wondering if tepphar 881w stretches like crazy then should I just go for 30/32 or 31/32? or just stay with 32/32?

I usually go for 29/32 for strechy thanaz and 30/32 for 100% cotton thanaz.